Process of rolling ingots.



J. 0. B. TROTZ. PROCESS 0F ROLLING INGOTS. APPLICATION FILED ooT. s, 190s.

965,050. l Patented Ju1y19,191o.

2 SHEETS-SHEET 1.

J. 0. E, TROTZ. PROCESS 0F ROLLING INGOTS. APPLICATION FILED 00T. 6,*1908.

965,050. l Patented. July 19, 1910;

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JOHAN O. EMANUEL TROTZ, 0F WORCESTER, MASSACHUSETTS.

PROCESS OF ROLLING ING-OTS.

Specification of Letters Patent.

Patented July 19, 1910.

Application filed October 6, 1908. Serial No. 456,461.

To all whom it may concern:

Be it known that I, JOHAN O. EMANUEL TRorz, a citizen of Sweden, residing at Worcester, in the county of Torcester and Commonwealth of Massachusetts, have invented a new and useful Improvement in a Process of Rolling Ingots, of which the following is a specilication, accompanied byA drawings, forming a part of the same, in which- Figure 1 is a plan view of a three high rolling mill. Fig. 2 is a diagrammatic view of the rolls, showing the series of passes arranged or my improved process. Figs. 3 and 4L are vertical sectional views.

Similar reference characters refer to similar parts in the different views.

My present invention relates to a new and improved method of rolling ingots, and to a three high rolling mill for carrying my invention into eiect whereby the number of consecutive passes required for a given reduction of the ingot is reduced in number, enabling the length of the rolls to be materially decreased, thereby securing greater rigidity in the rolls and greater accuracy in the dimension of the rolled metal.

In carrying my present invention into practice I employ a three high mill having a series of consecutive passes for the reduc 'tion of the ingot arranged in upper and lower rows, and having means for raising and lowering the ingot from the plane of one row to that of the other, as is common in three high mills.

It has been the practice heretofore to reduce 'the ingot in cross section in one dimension only by the lirst pair of upper and lower passes, and subsequently reduce the ingot in cross section in the other dimension by the next succeeding pair of upper and lower passes, turning the ingot between each subsequent pair of passes.

By the practiced method of rolling ingots in a three high mill, as above described, the height of the first pass in the second pair of passes and in each subsequent pair of passes is suiiiciently less than the width of the last pass in the preceding pair of passes to give the desired reduction of the ingot, but is greater than the height of the preceding ass. P In a three high mill adapted to carry my present process 'into practice the height of the lirst pass in 'the second pair of passes and each subsequent pair of passes is less than the height of the last pass in the next preceding pair of passes. By theV method as now practiced the ingot is reduced in one dimension only by each pair of passes, requiring a secondv pair of passes for its reduction in the other dimension, and necessitating rolls of considerable length for the requisite reduction of 'the ingot.

By my process as hereinafter described, I make each pair of passes in the rolls do double duty. The number of passes in each set o rolls in a three high mill can be reduced in number, thereby shortening the rolls and rendering them more stiii and rigid. I have found in practice that by my improved process the rolls of a three high mill can be reduced by my improved method of rolling approximately one third in length, giving rolls of sutiicient rigidity and stiffness to enable the ingot to be rolled to its finished size with suiiicient eXac'tness, by means of a linishing pass at the extreme end of the rolls and neXt the roll housings.

Referring to the accompanying drawings, which represent a `three high rolling mill having its passes constructed and arranged in accordance with my new and improved method of rolling ingots,` A represents the roll housings and C, D and E the rolls of a three high mill journaled therein. Between the lower and middle rolls C and D are the reducing passes F, Gr, H and I, and between the middle and upper rolls D and E are the reducing passes J, K, L and M, and between the lower and middle rolls C and D is a final or finishing pass N. Upon opposite sides of the rolls are ingot supporting tables O and P, capable of being raised and lowered by hydraulic plungers or other means in position to support the ingots in alinement with either the lower or upper row of passes between the rolls C, D and E.

In the drawings the tables O and P are represented by solid lines in position to support the ingot' in alinement with the lower rowV of passes, and by the broken lines O1 and P1 in position to support the ingot in alinement with the upper row of asses.

The ingot Q is first rolled t rough the pass F, Fig. 2, and returned through the indicated at Q2 pass J, the movement of the ingot being indicated by the arrows a and b. The width of the iirst pair of passes F and J is substantially the width of the ingot, but the height of the first pass F is sufliciently less than the vertical thickness of the ingot to eii'ect the desired reduction. The width of the second pass J is the same as the pass F, but its vertical height is suiiiciently less than the vertical height of the first pass F to accomplish the second reduction in the thick-V ness oi the ingot.

In the present instance the ingot Q, having its cross section indicated by the broken ines Q1 and approximately 12 square, in passing through the pass F into the position is reduced in thickness to -1-, having its cross section indicated by the broken lines Q3. The tables O and P are then raised into alineinent with the upper row lof passes and the ingot brought into the position at Q4, to be returned through the upper pass J into the position at Q5, and having its thickness still further reduced to 8 as indicated in cross section by the broken lines Q0. The tables O and P are then lowered into the position shown by solid lines in Fig. 4t and the ingot is turned one quarter revolution around its longitudinal axis, so as to be supported on its edge as shown at Q7, the dimensions of the ingot in cross section being indicated at Q8, having a horizontal width of 8 and a vertical thickness of say l2. The ingot is then returned in the direction of the arrow c through the first pass F int-o the position at Q9, with its cross section reduced in thickness to 93;, as indicated by the broken lines Q10. The tables arethen raised bringing the ingot into the position at Q11, from which it is returned in the direction of the arrow d through the pass J into the position indicated at Q12, having its vertical thickness reduced to 8.

The width of the second pair of passes G and K is equal to the height of the last pass J in the rst pair of passes, in the present instance 8, while the height of the first pass G of the second pair is sufiiciently less than the height of the last pass of the preceding pair to accomplishthe desired reduction in the thickness of the ingot which, in the present instance, is 6%. The ingot after having been returned for the second time through the pass J, as above described, and having its cross section reduced to 8 in thickness and to 8 in width plus a slight increase, due to the spreading of the ingot during its two last reductions, is then turned one quarter revolution so as to be supported upon one of its 8 sides, and is then rolled through the pass G, leaving its dimensions 8 wide by 6% in thickness. The ingot is then returned through the upper pass K of the second pair by which its thickness is still further reduced, in the present instance, to 5%. The ingot is then turned one quarter revolution and rerolled through the passes G and K, reducing the ingot in cross section to approximately 5% square.

The third pair of passes H and L have their width equal to the height of the last pass in the preceding pair which, in the present instance, is 5.12, but the height of the first pass I-I is less than the height oi the last pass in the preceding pair, in the present instance, 5, while the height of the second pass L in the pair is et. The ingot is then rolled twice through the third pair of passes H and L, with one quarter turn between each rolling as previously described, and the same method is pursued with regard to the fourth pair of passes I and M. After the iinal rolling through the pass M the ingot is rolled through the finishing pass N, which leaves the rolled metal the exact dimensions required in cross section.

By the above method of rolling, the number of passes in the rolls and, consequently, the length of the rolls is considerably reduced from that required in the method now commonly practiced. I have found, for example, that the rolls of a three high mill when made in accordance with the method now commonly practiced are over 80 in length, whereas the same reduction in the ingot can be accomplished by my improved method of rolling with rolls 53 in length. This reduction in the length of the rolls and reduction in the number of passes not only reduces the cost of the rolls, but also increases their stiiiiness and rigidity as the distance between the housings is reduced.

I claim:

l. The method of rolling ingots, comprising reducing the ingot in cross section in one dimension by rolling it through a pass of the desired dimension, turning the ingot a quarter turn around its longitudinal axis and rolling it through the same pass in the opposite direction to accomplish its reduction in the other dimension.

2. The method of rolling ingots, comprising rolling the ingot through each pass in opposite directions and imparting a quarter turn around its longitudinal axis to the iugot between its passages through the pass in said opposite directions, whereby said ingot is reduced in two dimensions by said rolling in each pass.

3. The method of rolling ingots, comprising rolling the ingot twice through each pass and imparting a quarter turn to the ingot around its longitudinal axis between each rolling through each pass.

4L. The method of rolling iiigots, comprising reducing the cross section of the ingot in one dimension by rolling it through a pass of the desired dimension, turning the ingot a quarter turn around its longitudinal axis and reducing it in cross section in the other dimension by the same pass.

5. The method of rolling ingots n a mill 5 .having a series of passes, comprising reducing the ingot in cross section in two dimensions by each pass in said series, turning the ingot a quarter turn around its longitudinal axis between such reduction by each pass and transferring the ingot to the succeeding pass. 1 0

JOHAN O. EMANUEL ,TROTZ Witnesses:

PENELOPE COMBERBACH, RUFUS B. FOWLER. 

